1. La materia puede estar principalmente en tres estados: sólido, líquido y gaseoso. El modelo que mejor representa la unión (Cohesión) entre las moléculas de un sólido es: A. Porque tienen forma y volumen fijo B. Porque tienen forma variable y volumen fijo C. Porque tiene forma y volumen variable D. Porque

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

hypostyle hall;